Gun Control at the U.N.

A treaty that the worst governments will simply ignore.

President Obama is having a hard time passing a gun-control bill at home, but earlier this week the Administration signed on to a U.N. effort to control guns around the world.

On Tuesday the U.N. General Assembly voted 154-3 to approve a treaty that regulates the international arms trade. The vision behind the measure is that, with enough paperwork, weapons can be kept out of the hands of bad guys. The more likely outcome is that...